Directions

Place potatoes, water and 1/2 teaspoon salt in a 3-quart microwave-safe baking dish. Cover and microwave on HIGH for 15 minutes until potatoes are tender; stirring once. Add peas. Cover and microwave on HIGH for 3 minutes until peas are crisp-tender. Rinse with cold water and drain. Cool to room temperature.
Combine mayonnaise, yogurt, mustard, onion, dill, garlic and remaining 1/4 teaspoon salt in large bowl; mix well. Add potatoes and peas. Toss until evenly coated. Cover and chill 1 hour before serving.